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carbohydrates

...are glucose, fructose, and galactose; disaccharides include sucrose (table sugar), lactose (milk sugar), and maltose. A slightly more complex type of carbohydrate is the oligosaccharide (e.g.,
raffinose and stachyose), which contains three to 10 saccharide units; these compounds, which are found in beans and other legumes and cannot be digested well by humans, account for the gas-producing...

oligosaccharides

...large number of oligosaccharides have been prepared by partially breaking down more complex carbohydrates (polysaccharides). Most of the few naturally occurring oligosaccharides are found in plants. Raffinose, a trisaccharide found in many plants, consists of melibiose (galactose and glucose) and fructose. Another plant trisaccharide is gentianose. Maltotriose, a trisaccharide of glucose, occurs...

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